Canopy- pagoda/cabana

The structure would be relatively simple to build, I think. The entire area under the roof would be enclosed by screen, with canvas/tarp curtains that could be raised/lowered. The platform around the pod doesn’t offer much elbow room, though.

Yes, I was thinking about standing-seam metal; it’s durable and can be recycled.
(Sidenote: I’ve seen a lot of corrugated metal roofs on houses lately, which worries me. The rubber gaskets on the fasteners won’t last as long as the rest of the roof, and they’re guaranteed to leak.)